Put 2 cups of crushed ice and 1/4 cup of rock salt into the quart-size zip-close bag. Pour the milk, heavy cream, sugar, and vanilla into the sandwich-size bag. Seal this bag tightly.

Place the smaller bag inside the larger bag. Gently squeeze out the air and seal it carefully. Continue squeezing it gently for about 5 minutes (be careful — it gets very cold). What is happening inside the bag?

Drain the water from the larger bag, and add the remaining ice and salt. Seal and squeeze until the mixture is very thick.

Remove the small bag from the ice and dry the outside of the bag. With scissors, cut one of the bottom corners off the small bag and squeeze the contents into small bowls. Enjoy!

Learning Benefits:

develops observation and experimentation skills

provides experience with cause and effect

From Fresh & Fun: January by Pamela Chanko
(Scholastic Professional Books)